No.5（2002）19.Measurement of dose distribution for the irradiation field of 60Co gamma sources

Masayuki SEKIGUCHI, Eiko HOSODA , Shiroharu SUGIURA, Yoshihiko WATANABE and Atsushi MAKINO

An estimation was made of dose distribution of the irradiation field of new-designed ⁶⁰Co gamma ray source, which recycles used sources of medical facilities. Dose distributions in the 2π direction on the surface of the source stand of new and existing sources ware compared. The dose distribution of the new source is uniform in comparison with that of the existing one. As the irradiation position is close to the source, the dose distribution in the height direction is greatly influenced by the construction of the source holder. At the range less than 4 cm in the height of the position from 'E' to one nearer the source, a reduction in the dose-level was obserbed. Furthermore, the difference between the characteristics of dose distribution estimated by Ceric-Cerous dosimeter and Radcon dosimeter was investigated.

Keywords
Cobalt-60, Gamma-source, Dose distribution

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